Bukkit

from 0.8.x to 0.9.0
add this lines to the config and Language files

config.yml

rain-duration=4000
use-economy=true
dayvote-cost=0
nightvote-cost=0
sunvote-cost=0
rainvote-cost=0
english.lang

english.lang

VOTE_COST=You have payed %cost% for this vote.

from x.x.x to 0.8.x
please let you config and language file rebuild

from x.x.x to 0.7.x
please let you config and language file rebuild

from 0.7.0 to 0.7.2
change VOTE_BROADCAST_PERMISSION to VOTE_BROADCAST
in your language file

from 0.5.x to 0.6.x
add

VOTE_NO_PERMISSION=You have no permission to vote for that

to your language files